Casting Out Nines Worksheet

Speed calculation lesson 13: Check it with nines · Set 355 · 40 questions

The fast method (Casting out nines): Find the nine-check number of each number: add the digits until one digit is left. Do the same sum (× or +) with those digits and shrink the result to one digit too. Shrink the given answer. Different → wrong. Same → it passes the check.

1. 1.Check with nines: 55 × 19 = 1053. Correct or wrong? (a) wrong (b) correct
2. 2.Check with nines: 305 + 619 = 918. Correct or wrong? (a) correct (b) wrong
3. 3.Check with nines: 93 × 86 = 7994. Correct or wrong? (a) wrong (b) correct
4. 4.Check with nines: 17 × 16 = 275. Correct or wrong? (a) correct (b) wrong
5. 5.Check with nines: 79 × 12 = 950. Correct or wrong? (a) wrong (b) correct
6. 6.Check with nines: 73 × 81 = 5913. Correct or wrong? (a) wrong (b) correct
7. 7.Check with nines: 90 × 24 = 2160. Correct or wrong? (a) wrong (b) correct
8. 8.Check with nines: 87 × 46 = 4002. Correct or wrong? (a) wrong (b) correct
9. 9.Check with nines: 76 × 35 = 2666. Correct or wrong? (a) wrong (b) correct
10. 10.Check with nines: 172 + 420 = 592. Correct or wrong? (a) wrong (b) correct
11. 11.Check with nines: 27 × 52 = 1404. Correct or wrong? (a) correct (b) wrong
12. 12.Check with nines: 68 × 89 = 6057. Correct or wrong? (a) correct (b) wrong
13. 13.Check with nines: 29 × 42 = 1224. Correct or wrong? (a) wrong (b) correct
14. 14.Check with nines: 158 + 470 = 629. Correct or wrong? (a) correct (b) wrong
15. 15.Check with nines: 71 × 51 = 3629. Correct or wrong? (a) correct (b) wrong
16. 16.Check with nines: 146 + 659 = 805. Correct or wrong? (a) wrong (b) correct
17. 17.Check with nines: 651 + 547 = 1198. Correct or wrong? (a) wrong (b) correct
18. 18.Check with nines: 985 + 621 = 1606. Correct or wrong? (a) wrong (b) correct
19. 19.Check with nines: 150 + 812 = 962. Correct or wrong? (a) correct (b) wrong
20. 20.Check with nines: 60 × 58 = 3480. Correct or wrong? (a) correct (b) wrong
21. 21.Check with nines: 695 + 610 = 1301. Correct or wrong? (a) wrong (b) correct
22. 22.Check with nines: 171 + 543 = 721. Correct or wrong? (a) correct (b) wrong
23. 23.Check with nines: 99 × 75 = 7433. Correct or wrong? (a) wrong (b) correct
24. 24.Check with nines: 55 × 13 = 715. Correct or wrong? (a) wrong (b) correct
25. 25.Check with nines: 942 + 717 = 1657. Correct or wrong? (a) correct (b) wrong
26. 26.Check with nines: 54 × 32 = 1728. Correct or wrong? (a) correct (b) wrong
27. 27.Check with nines: 896 + 867 = 1766. Correct or wrong? (a) correct (b) wrong
28. 28.Check with nines: 35 × 77 = 2694. Correct or wrong? (a) correct (b) wrong
29. 29.Check with nines: 740 + 296 = 1036. Correct or wrong? (a) wrong (b) correct
30. 30.Check with nines: 83 × 59 = 4905. Correct or wrong? (a) correct (b) wrong
31. 31.Check with nines: 57 × 51 = 2907. Correct or wrong? (a) wrong (b) correct
32. 32.Check with nines: 616 + 382 = 1002. Correct or wrong? (a) correct (b) wrong
33. 33.Check with nines: 24 × 40 = 960. Correct or wrong? (a) wrong (b) correct
34. 34.Check with nines: 711 + 423 = 1134. Correct or wrong? (a) wrong (b) correct
35. 35.Check with nines: 54 × 12 = 648. Correct or wrong? (a) wrong (b) correct
36. 36.Check with nines: 39 × 95 = 3702. Correct or wrong? (a) wrong (b) correct
37. 37.Check with nines: 711 + 279 = 990. Correct or wrong? (a) correct (b) wrong
38. 38.Check with nines: 257 + 982 = 1239. Correct or wrong? (a) wrong (b) correct
39. 39.Check with nines: 85 × 87 = 7395. Correct or wrong? (a) wrong (b) correct
40. 40.Check with nines: 654 + 722 = 1376. Correct or wrong? (a) wrong (b) correct

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